Frequently Occurring First Names and Surnames from the 1990 Census
The Census Bureau has embarked on a names list project involving a tabulation
of names from the 1990 Census. These files contain only the frequency of a given
name, no specific individual information. The database is searchable by male
or female given name, and by surname.

Twenty censuses : population and housing questions, 1790-1980.
Available at the Connecticut State Library.

United States
historical census data browser Searchable historical data from U.S. decennial
censuses from 1790 to 1970. Data availability varies by year and state, but
are usually presented for the state and county levels.

Surname to Soundex code Searchable index offers users the opportunity
to find names in the Soundex, a system developed by the National Archives to
index the U.S. censuses from 1880 onward.

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Connecticut State Library.